A plaque from 1976 proclaiming Jamaica Plain as the "Eden of America" will be reinstalled Wednesday at the Centre Street post office more than a decade after it was removed due to construction. The plaque will be reinstalled by the Bulfinch Company June 27 during a short ceremony starting at 3:30 p.m. at the Jamaica Plain Post Office (655 Centre St.). The plaque is the third in a series of bicentennial plaques that were reinstalled after being relocated in the last two years, said Gretchen Grozier, president of the Jamaica Plain Historical Society (JPHS). Many similar plaques were installed during the bicentennial in 1776 throughout Boston neighborhoods. The one by the post office was on the Myrtle Street side of the old post office and reads, "Jamaica Plain is the Eden of America."